Ubuntu 10.04 Postfix Dovecot ISPConfig 3 - send spam from own domain to random users

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http://serverfault.com – My Config: Ubuntu 10.04 Postfix 2.7.0 Dovecot 1.2.9 ISPConfig I've got the problem that a unknown / invalid user e.g dexter_rollins@xxxx> sends mails to different emails. Every 5 - 7 min it's send 10 emails with random senders and recipients but senders domain is managed by this server. if i stop apache it stops. Is there an solution how to find the error or miss configured form or is it possible to fix it with postfix? mail.log shows this: Jan 24 22:00:30 xxxx postfix/qmgr[5489]: 342E47F580BA: from=, size=1826, nrcpt=1 (queue active) Jan 24 22:00:30 xxxx postfix/qmgr[5489]: 3E9D7 (HowTos)